Ultrasonic Flow Sensing

Introduction

Ultrasonics for flow measurement uses the time of flight principle, where the time taken for ultrasound pulses to travel between a transmitter and receiver is measured, both with and against the flow. By comparing the two values allows both the flow velocity and the speed of sound in the fluid to be measured.

The use of ultrasonic time of flight gives a number of benefits. A high linear accuracy (about 1% of the flow rate) with a wide measuring range, and this accuracy is maintained by the use of a digital signal which eliminates Drift. It can also measure zero flow.

It has no moving parts providing long term reliability and stability with no start-up inertia. Having little or no intrusion into the flow path pressure drop is minimised or eliminated. With a bi-directional flow measurement capability - in liquids and gas at both low and high pressures - the sensors are largely unaffected by extreme temperatures, fluid viscosity and densities whilst providing high corrosion resistance.

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